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A: It is a core-lock type. The manufacturer describes it as "a semi-jacketed bullet with a cut-trough edge in the jacket which partially locks the lead core at the same time. The bullet effect depends on the target resistance – it gets deformed in light game to a lesser extent than in heavy game. It is appropriate for cloven-hoofed game hunting."

A: There is a special cut-through edge - almost a crimp - along the ogive (curved forward portion) of the bullet that partially locks the jacket to the core. This means that the bullet will retain weight well, even if it hits a toughly constructed target.

A: This is new production 8x57 ammo manufactured with boxer-primed brass cases that can be reloaded. It also utilizes non-corrosive primers, meaning that it has no special cleaning requirements. Because this 8x57 ammo is new production, the chances of it failing to fire are practically zero. None of the above can be said about military surplus 8x57 ammo from a spam can.

This can definitely be confusing, and the reason is that many minor changes were made to the 8x57 cartridge over the years as it was adopted by various militaries and used in civilian hunting rifles as well. The simple answer to your question is that the "I" on some German rifles (which stood for "Infantry") was misinterpreted as a "J," and the mistake stuck so well that it eventually became the commonly used name of the cartridge. In other words, 8x57 IS and 8x57 JS are the same cartridge - a .323" bore and a non-rimmed case.

However, there is more you should know about 8x57 ammo. You will also see 8x57 JRS, 8x57 JR, and 8x57 J. The "R" stands for "rimmed" and is intended for use in break action weapons - ammo without the "R" is designed for bolt actions. Without the "S" in the name, the projectile diameter is actually different as well - .318" for the "non-S" and .323" for the "S." Prior to 1905, German rifles were manufactured with the .318" bore diameter. If you have an 8x57 rifle, you should make sure that you know the chamber dimensions and bore diameter before buying ammunition for it. While shooting .318" projectiles in a .323" bore will only result in poor accuracy, doing the reverse is potentially hazardous.

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